[RFC PATCH] mm: remove zap_page_range and change callers to use zap_vma_page_range

[Christoph Hellwig]

>  		unsigned long size = vma->vm_end - vma->vm_start;
>  
>  		if (vma_is_special_mapping(vma, vdso_info[VDSO_ABI_AA64].dm))
> -			zap_page_range(vma, vma->vm_start, size);
> +			zap_vma_page_range(vma, vma->vm_start, size);
>  #ifdef CONFIG_COMPAT_VDSO
>  		if (vma_is_special_mapping(vma, vdso_info[VDSO_ABI_AA32].dm))
> -			zap_page_range(vma, vma->vm_start, size);
> +			zap_vma_page_range(vma, vma->vm_start, size);
>  #endif

So for something called zap_vma_page_range I'd expect to just pass
the vma and zap all of it, which this and many other callers want
anyway.

> +++ b/arch/s390/mm/gmap.c
> @@ -722,7 +722,7 @@ void gmap_discard(struct gmap *gmap, unsigned long from, unsigned long to)
>  		if (is_vm_hugetlb_page(vma))
>  			continue;
>  		size = min(to - gaddr, PMD_SIZE - (gaddr & ~PMD_MASK));
> -		zap_page_range(vma, vmaddr, size);
> +		zap_vma_page_range(vma, vmaddr, size);

And then just call zap_page_range_single directly for those that
don't want to zap the entire vma.